Estimated anionic contributions computed from chi_(anion)^(2) = chi_(electrolyte)^(2) - b(I_IR x I_Raman)^(1/2), where b is a scaling factor. Gaussian fits to guide the eye are shown as dashed lines. The frequency trend observed for the anionic contributions is consistent with the hydrogen-bond strength expected for the halide series and agrees with the predictions of the stratification picture.
